Weather strip construction



Patented Sept. 19, 1944 UNITED STATE-5f PATENT .QFFICE' y v A n `WA'lfIEIt'STIJZNSTRUCTIoNv" 1 l "Forrest F. Beil, Clinton, Companies Incorporat Y' poration of Iowa Iowa, assignor to yCurtis ed, Clinton,jlowa, a cor- Appiication september 22, 194i, serial No. 411,867 (C1. 2li-52.4)

1 claim.

My invention relates to a weathersealing construction for the common double hung window. An object of my invention is to provide a weather sealing construction for a window `which will be equally weather-tight for various degrees of shrink and swell of the differentpartsof the window.

A further object is to construction which will though the window is made with such ample mechanical clearance between the sash stiles and the jamb as to avoid sticking under maximum humidity conditions. f

provide a weather strip .give a tight seal even Another objectv is to provide a weather strip Y which will overcome any tendency of the window to rattle when made with mechanical clearances as referred to above. s 1

Another object is to provide a weather strip which shall engage the sash uniform amount of friction per unit length-this friction being variable in a minimum degree with changes in atmospheric conditions.

Still another object is to provide a weather strip construction which can be readily and economically manufactured of wood or similar nonmetallic materials.

With these and other objects in View, my invention consists in the construction, arrangement and combination of the various parts of my weatherproof window construction whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in the accompanying drawing, in which:

Figure 1 is a perspective sectional View of a fragmentary portion of a window embodying my construction;

Figure 2 is a horizontal cross sectional View through such a window; and

Figure 3 is an enlarged perspective View of the weather strip member.

The disadvantages of the ordinary type double hung window are well known. If made with small enough clearance so that it does not leak excessively in cold dry weather, Vit gives trouble due to sticking of the sash in relatively humid weather. An important function of a weather seal construction, therefore, is to give a good seal throughout the range of shrinking and swelling which may be experienced by the wood parts of the window.

In the common type of window, if there is clearance enough for easy operation, a little wind or vibration of the building will cause the sash to rattle annoyingly. Hence it is desirable that with a substantially pension is desired, y the the `weather seal or swollen.

If the` builder desires to Vavoid the disadvan-v Y tages of pulley-and-weightsuspension Vby using springs, then it is important to have the friction betweensash and jamb uniform, controllable, and subjectto. minimum .variation with changing atmospheric conditions. Y In the accompanying drawing I haveused the reference numeral I0 to indicate a side jamb of a window frame. The numeral I2 indicates generally the upper sash, and the numeral I4 indicates generally the lower sash. n

In Figure 1 may be seen a stile I6 and a meeting or check rail I8 of the upper sash I2, and a stile 20 and the-check rai-l 22 of the lower sash I4. Y

Fitted in a groove in theside jamb I0 is the customary parting stop 24. Where spring sussash members may be formed with grooves l26, and `the j amb with corresponding grooves 28 to receive the springs 30. Y t ,Groovesy 32 are formed in` thevertical edges of the sash I2 and I4, and corresponding grooves 34 are formed in the side jamb.

For making a weather-tight, easy-sliding joint I provide a weather strip member 35 Vwhich is shown particularly in Figurev 3. This strip can be made of wood or other similar material, and is conveniently formed from a piece having rectangular cross section. One edge of such a piece is left in rectangular form, and constitutes the base of the strip, which fits snugly into the groove 34 of the jamb. The part Aof the strip which eX- tends out of the groove 34 I may refer to for convem'ence as the projecting portion, and the edge or end surface of this portion as the projecting edge. 1 The projecting edge of the strip and the side portions adjacent that edge are formed in a manner particularly adaptable for carrying out the objects of my invention. In the sides, two longitudinally extending concave grooves 36 are formed. The shape of these grooves is such that the thickness of the strip at all portions which project out of the groove 34 is substantially reduced, except along two convex surfaces adjacent the formed edge of the strip. These two surfaces, indicated'at 38 and 40 in Figure 1, fit against the sides of the groove 32 inthe sash, giving not one but two seals against the passage of cold air and dirt between the sash and jamb. In the projecting edge of the strip I cut a, saw kerf 42 which extends into the strip well toward the deepest portion of the grooves 36. The effect of the saw kerf, of course, is to give a degree of flexibility to the engaging surfaces of the strip, s that. when they contact the sides of the It should be noted that the weather strip guides Y the movement of the sash, so that the latter can be placed in the frame with adequate mechanical clearance, as indicated, for example, at 46, soY for frictional engageframe' at otherV placesV than along the weather strip.

that there is no occasion ment by the sash with the It will be also noted that vwith the strip made as above described, the rubbing sur- `weather l excessive friction unnecessarily increases the difficulty of raising or lowering the window. It will thus be appreciated that I have provided a structure which is advantageous in that it will maintain a closely uniform degree of friction, and of course, this amount of friction can be established in manufacture by controlling the distance between the surfaces 38 and 40 of the strip 35, relative to the width of the groove 32, and also by controlling the ,depth of the saw kerf 42, to just the correct amount for holding j the window in place at its extremes of movement.

faces are limited in extent, consisting vof the re l.

atively narrow line on each side of the strip. The area in vary substantially with changes in temperature and humidity. The swelling ofthe woodjtakes place almost entirely inadirection across the grain rather, than lengthwise o f the wood. Hence there is an advantage in the fact that the groove 32 is relatively narrow, since the expansion which takes place acrossthefwidth of this groove will Y, be a relatively small part of theexpansion or contraction in the total-'thickness'of the sash. Any expansion or contraction which does take weather frictional contact will not place across the'grainA of the sash stiles willbe expansion 4or shrinkage grainY of the weather the latter is made offsimilar frictionalfpressure will remain substantially matched by taking place across the strip itself when Wood, so that the practically constant..r

The feature, of ability to Vretain'uniformvalue o f friction is important wherespring suspension is used, inasmuch as a spring is usually selected which will balance the sash midway of its travel. Therweather strips-mustprovide sufficient frictionso that the window will stay in position at either extreme of its movement, but ofcourse ber as fixed in the jamb,

l Although I have shown the weather strip memit will be apparent that so that the weather strip and slides in the groove in case the results obtained the same as I have above it may be reversed, is mounted in the sash the jamb, in'which would beL substantially described.

Some otherchanges may be made in the details of the construction and Yin the Aarrangement of the parts'of Vmy invention without departing from thereal spiritfand purpose thereof, and it is my intention to cover by my claim any modified forms of 'structure or use of mechanical equivalentawhich maybe reasonably included within their scope.

I claim as my invention: Y' The combination of a frame having vertical opposite grooves, and asash slidable in the frame, having simil"r'registeringfgrooves, the sash having at the bottoms of saidgrooves vertical saw kerfs, withsealing strips'having'portions of substantially rectangular cross section snugly `received in the first grooves andA portions slidably received in the second'de'scribed grooves, to frictionally engage the sides thereof, :said last named portions having' deep, vertically elongated slots f opposite said saw kerfs and having channels yin their fsides, whereby theV parts on opposite sides of the slots have'some flexibility.

FoRREsT F, BEiL. 

